Nope. " 37" was the standard serial number for the 173 ("49" for the 173D, "59" for the 173A). The first digit indicated voltage, 1 = 6VDC, 2 = 12VDC. The P series were produced in the 1960's up to 1968 (N series in the 1950's, R series 1968-1976), so 2P37H7 would likely be 1967 production, the last year for the small diameter dome on the 17 and 173.
I do not know the exact date when the 173 was introduced, but I think it was around 1950. From the start and up until 1964, the 17 and 173 used the small dome. From 1964 to 1968, Federal was making some 17's and 173's with the larger dome, but most of them still used the smaller dome. In 1968 Federal standardized the skirt and dome sizes on the Beacon Ray line with all of them using the larger dome until production ceased in the 1980's.