RENE states about 500 BKH-34X made and about 1500 BKH-36X made without the digit-prefix serial number. Consider that there were over 3000 Hawkeyes made. 10,000 to 12,000 Lightweights made. 4 to 5 thousand Mahogany Cased Supers, 1500 to 2000 7 1/2 in. .44 Flattops. And 1500 10 in .44 Flattops. Not to mention that there were about 70,000 total Old Model Flattops made. When you look at those numbers, and look at the prices that they bring. I would think a non-prefix Blackhawk Convertible would be worth a very large premium over a digit-prefix Blackhawk, in which many thousand were made. If you are trying to complete a set of 357s, then this one is one tough cookie to find.