So that begs the question, were there scramblers built from '57 on that were not Catalina's?
Someone who is used to scientific precision could go crazy trying to make perfect sense of BSA records...
In the article I referred to above Ian didn't address the issue of U.S-only Catalina scramblers vs. those for the rest of the world. He says the '57 batch of B32s had CB32 frames but "Catalina" in the despatch records, but the '59 batch had CB32C frames but did not
use the word "Catalina." They're recorded as either "B32 Scrambles" or "B32 Gold Star Scrambles" (although he doesn't explicitly say so, presumably he would have commented had any of the CB32C frames been sent anywhere other than to the U.S.). He says nearly all the 500 Catalinas also are listed as "B34 Scrambles," but he uses the CB32C frame to identify them. Only 4 of the last ones in CB32C frames produced in 1963 are listed in the despatch records as "B34 Gold Star Catalina Scrambler."
OK, although I don't have access to the despatch records to answer your question the least I can do is to further muddy the waters. Turning to the 1962 Smiths catalog we find the units used on the "B32 & B34 Gold Star (U.S. only)" and on the "B32 & B34 Gold Star Scrambles." However, as we know, there weren't any B32 Gold Stars of any kind in 1962. But, maybe Smiths just carried on listing the B32 by default.
Turning to the 1960 catalog there are two
separate listings each
for the "B34 Gold Star Scrambler 499cc" and the "B34 Gold Star Scrambler 499cc (N. America Only)." This isn't an accidental duplication because there's a mix of speedo/tach numbers.
Anyway, combining all this information it seems that through at least 1962 there were the 500 c.c. U.S.-only "Catalina" scramblers (in CB32C frames) frames as well as ordinary, run of the mill, nearly-worthless scramblers (in CB32 frames) for the lesser countries of the rest of the world. However, to keep the rest of the world from being too jealous, they mostly avoided using the word "Catalina" in the despatch records for the bikes in CB32C frames.