1948 Sub Second?

Ebay listing for this is here:

global.ebay.com/BULOVA_SUB_SECOND_WINDING_VINTAGE_USA_MENS_WATCH/270640254628/item

The date stamp on the movement shows 1948.  The listing describes it as a "Sub Second" Model, 21 Jewels, 7AK movement

CASE DIAMETER : 23mm with crown
CASE SIZE LUG TO LUG : 37mm Lug to Lug