* note on this 1972 Dealer sheet Ladies models ID'd by variant.
http://www.mybulova.com/sites/default/files/vintage_ads/Bulova_AD_1972_…
A variant is a variation of a Model, 'Variants' within a model line are identified differently based on specific attributes.
ie:
'LA PETITE' "MB" on the dealer inventory sheet linked above has a 23 Jeweled Movement in a Yellow Case, Black Roman numerals and a Slver Dial.
'LA PETITE' "MC" is the "same as above in White"
note the difference: "MB" variant vs "MC" variant, although both Watches are the same 'LA PETITE' model they are different variations of Case and Dial colours.
The subject Watch has a White Case with White (Silver) numerals and Dial therefore cannot be the 'DC' variant as the 'CONCERTO' "DC" has Gilt (Gold) markers and a Champagne Dial.
According to the ad.
The 'CONCERTO' model is the ID, this White variation of which is unknown and by naming the "DC" variant of this model the ID actually becomes incorrect, not "close".