My apologies if this has already been discovered, I am reading from my FASA printing I bought some time ago (but I thought this continuity error needed to be reported):
1st printing, FASA, 1998
p. 172
Guillotine IIC entry, "Capabilities", middle of the last paragraph:
"The Adders used the new 'Mechs in 2892 against a raiding force from Clan Mongoose seeking genetic material on the Adders' homeworld. The Adder warriors fought a grueling five-hour battle against the determined Mongoose warriors..."
Problem: Clan Mongoose was Absorbed by Clan Smoke Jaguar in 2868, according to Era Digest: Golden Century, pp. 7-10 and Field Manual: Crusader Clans, p. 113, and possibly others.
Suggested fix: Change Clan Mongoose to another clan, or change the intro date for the Guillotine IIC (not recommended, fluff indicates Clan Coyote intentionally made it as a second-line BattleMech after OmniMechs were introduced, so continuity works)
Thanks!
Steve