This flick doesn't need another review. Even if you have as little soul as a worn Nike, you'll like it just fine.
Darn it Amazon. Will ya' STOP putting in TRIVIA that is just PLAIN WRONG?! The Guitar is a D-18, NOT a D-28 and it was made AFTER 1938 because the neck width is 1-11/16th inch width at the nut, instead of 1-3/4th inch at the nut, —as a 1934 or 1935 version would have. Plus, the body shape is slightly different prior to 1936. (Remember; the story stakes place in 1935).
Original price for a D18 in 1940 was $90. A D-28 was $100., If you multiply by about 34 times, you will get the modern new price for a new D-18 with identical tech specs. Price conversion is done by using comparative automobile prices, as automobiles use parts from almost every industry. E.g., a 1932 Ford, Model A, V-8 sold for about $900. This was Clyde Barrow's favorite car because it was FAST. Not even the cops had V-8s or straight 8s. In this case, the current resell price is skewed past Martins! Why? Because a 1932 Ford V-8 is also known as a DEUCE COUPE.
A prewar C.F. Martin D-28, built prior to 1943, in VG to EX- condition, will fetch about $50,000 - $60,000, and a D-18 of the same vintage slightly less (but not always).
A Martin D-18 mainly differs in that the back & sides are made from Honduras Mahogany, whilst a D-28 back and sides are made from Brazilian rosewood (Dalbergia nigra). A pre-1946, D-28 (prior to mid 1946) has herringbone purfling, not the type of celluloid tortoise-like binding that the D-18 in the film has, and ALL D-18s have. These days, a pre-war D-18 in VG condition made between 1939 and 1946 (as shown in this film), sells for a little less than a D-28, but not much less. A special D-18 may fetch more. The guitar in this film looks to be in VG- condition and has replaced tuning machines. Instead of the modern Grover Rotomatics, —it should have Grover open-back gear G-98s or plastic-head G-52s. This is minor and can be set back to original.
I have a 1940 D-28 which I play. It is worth absolutely NO money, because it is not for sale.
Some things, have an existential price.