For some games, I am starting to think the initial production vs extant PCBs can differ to a remarkable degree. For example, serial number data indicates 300 Akai Katana PCBs were made, but it is easily the rarest SH3 PCB in terms of how often it comes up for sale (outside of Mushi Matsuri 1.5 and AK LE) and how hard it is to find in a Japanese arcade. I would not expect that if 300 were really out there today. You see all the BLs up for sale far more often (and installed in more arcades) and the most they made of any of those was 200.
Here is a scenario I am considering: in the example of AK, 300 were made, but far less were actually sold. Those that were unsold were converted into AK LE or SDOJ (I have seen many SDOJ that are clearly AK conversions). So how many AK PCBs are really out there? Take a guess, but based upon its rarity mine is approximately 100.
This clearly also applies to Mushihime-tama and Pink Sweets, both of which sold poorly and thus hundreds were converted into other games.
In the case of Deathsmiles II, it is interesting because very few seem to still work these days. Thus we have to contend with the question of initial production vs extant working examples.