Theoben sirocco fac registered

[Sideleverjohn]

Hi all
How can I tell if a siroc co I have just bought at auction is registered as fac ?
The auction house made no mention of it, but as I left they asked me how can I tell if it is sub 12ftlbs and this has set my alarm bells ringing.
Is there a list of theoben air rifles I can check number against ?
Serial number is TR 12683.

Any advice welcome.

Thanks
Sideleverjohn

Update.
It is a .22 fenman (not sirocco)
Also has holes drilled in barrel shroud front and back, do these give a clue or even serve a purpose ?