The crystal may be a replacement, the watch is 65 yrs old! While I am the same age I have only owned the watch for for a short time. Nonetheless, the case in your picture ( 1946 Director) is different in that the lugs on my candidate are solid (without a corner notch) and do not extend beyond the crystal. I have seen several examples for sale that are the same (those had different crystals as well). The full numeral set on the dial of my candidate is the same design as in the ad picture, as are the hands. The example "Excellency" watches in the myBulova data set have abbreviated sets with only every other number, or the numbers in the 1948 version are shaped differently than those my candidate. The numerals in your 1946 Director picture are shaped differently than those in my candidate.