Hamilton prices, movements. Otto Young Catalogue, 1926

The 950 (without B) goes back to about 1900.
Prices of movement in basic cases from their adv. in a railroad magazine-
950- $103 list, $85 to RR men
992- $57.70, $48.50 (This was before 992B. 992B new double roller in troduced in 1940s (haven't checked exact date)
952- $70.30, $60.00
996- $54.50, $45.00
974- $30.40, $25.00

950 description- Bridge movement, pendant or lever set, 23 extra fine ruby and sapphire jewels in gold settings, Patent motor barrel, gold train, Escapement cap jeweled, steel escape wheel, double roller escapement, Sapphire pallets, Breguet hairspring, micrometric regulator, compensation balance, double sunk dial, Adj. to temperature, isochronism and five positions.

992 description- 3/4 plate movement, lever set only, 21 extra fine ruby and sapphire jewels in gold settings, double roller escapement, sapphire pallets, gold center wheel, steel escape wheel, micrometric regulator, Breguet hairspring, double sunk dial, compensation balance, beautifully damaskeened, adjusted to temperature, isochronism and five positions.

Informative adv. Descriptions given for other models as well.