Century Arms is more in the "inexpensive" area of FAL's. In other words this particular FAL was not made by FN, Steyr Mannlicher, nor DSA.
I am not saying it isn't an excellent rifle. Just understand this is a cheaper one, if you decide to sell it later. If it is the only FAL you are likely to own, they are excellent rifles.
I think they (Century Arms) may have been building those from demilitarized STG-58 parts kits which were common at one time. Look for a makers emblem on the upper receiver. If it is an "Imbel" receiver that is good. I am not familiar with off brand receivers. It is not anyone's military issue; whoever built it did not bother to refinish it, I think.
Look for more advice from others on cash value, but, I would say buy at $750; sell it for $1,000. It seems to show wear and the muzzle has no flash hider or muzzle break (nor bayonet lug), possibly for legal assembly reasons. That handguard is not Austrian. I am pretty sure it isn't Imbel either. Otherwise it looks stock.
A nice, new DSA custom could cost 2-3 times as much.
Edit: The L1A1 means it is an inch pattern, UK/Commonwealth production. Almost all English speaking countries made these, except US.