Good replies so far... I'll add my two-cents worth....
For insurance valuation ( assuming total loss due to theft or catastrophic loss ), I would go with the valuations in Look for the Dog...
For purposes of buying / selling, the market is really fickle...
I don't know if your question applies strictly to Victor products, but I think my following comments can be applied to most marques.
1) Condition of a given machine probably affects value as much as the brand / type. A pristine original always has greater value than an example that was consigned to a damp basement or chicken coop with a bad roof.
2) Build quality affects value - most collectors want these things to function. Machines such as Victor, Edison, Brunswick, Sonora, and most Columbia Disc machines had good to excellent engineering and build quality... other machines, especially "assembled", "client" machines may not have had good engineering and / or components ( think "lots of crumbling pot-metal" ).
3) Cabinet design - was/is the machine aesthetically pleasing ? ( Focusing on design more than condition: if it wasn't an attractive design, it will still be "ugly" even if pristine...)
3a) Finish - an uncommon finish can help increase a machine's value; but this is also linked to condition: a red mahogany "piano finish" in pristine condition will ( should be ) worth more than the usual crazed / alligatored examples... while a common finish, it is very labor-intensive to properly re-create. Finishes like fumed or Flemish Oak, Circassian walnut, "Chinese Chippendale", etc. can make an otherwise common / ordinary machine more interesting / valuable. Again, condition is critical... you might have a tough time getting a "fair price" for a Vernis Martin Victrola in poor cosmetic condition.
4) Unusual / interesting features - are there innovative, or just plain wacky mechanical other design features that make the machine interesting ?
5) Size of machine - storage & display space is (nearly) always a consideration, plus transporting the machine. These can influence buying / selling price, but should have little effect on insurance valuation.
6) Production numbers - How many were made ? A really common machine such as a Victrola XI, where over 800,000 were made over a ten-year run, is probably not worth as much as, say, a Flat-top Pooley VTLA, or maybe a Victrola XII (table model with the really short doors), even though the XI is probably a better-performing machine than the other two. Again, condition and veneer / finish type figure in this.
7) Early and External Horn machines - these are more difficult to put pricing on, due to rarity and infrequency in the marketplace. Really early examples, such as anything marked "Berliner" or "North American Phonograph Company" is rare and pricey; more common external horn machines (as long as complete and restorable) seem to easily run in the four-figure range. Vertical-wind Johnson / Berliner machines, "tin-can" lever-wind machines, etc. are quite rare and prized among collectors.
"Odd-spindle" machines, such as "Standard", "United", and "Aretino", even though external-horn, can be tricky, as these machines will play only their proprietary records (or those with a larger spindle hole, using an adapter.) The Aretino, with its 3-inch spindle, is more a museum-piece than a user-talking machine. This can have an adverse effect on their price.
All that said, in my experience here in Northeast Pennsylvania, working with about a 250 mile radius, here's my basic pricing guide-lines for average talking machines:
Victrola, Columbia, Edison Diamond Disc-
Table-model w/o lid - $250 and less
Table-model w/ lid - $350 and less
Upright (skinny) floor model- $400 and less
Console ("low-boy")- $250 and less
Orthophonic small (4- series) - $400 and less
Orthophonic medium (8-12, etc.) - $750 and less
Orthophonic large (Credenza / 8-30) - $1,000 and less
Orhtophonic Changer machines - ????
These prices assume machine is complete and functional, and in good condition, needing only cleaning and lubrication, and probably reproducer rebuild to replace fossilized rubber to be completely presentable and functional. No broken / crumbling / frozen / missing hardware, no loose / missing veneer, no flower-pot stains, no dog-chewing on legs, etc.
It's hard to offer hard & fast pricing on such a wide variety of machines... so much depends on individual buyers' tastes and how much mad-money they have at a given moment.
The numbers I threw-out above are a run-up of what I have purchased / seen in person and on Craigs-list and e-bay over the last several years. I HAVE seen machines in the above categories priced MUCH higher; I doubt they have sold though...
I do not mean to demean anyone's "pet machine" or suggest that the above are "fair" prices. Just what I have personally encountered in NE/SE PA, Western NJ, Southern and Central NY state.
Boy - that's a lot of "gas" for two-cents...
