If yours has the ELG* without the crown, you are okay, no matter if the gun is functional or not. The crown was added half-way through 1893, at first they were two separate stamps, then in 1894 they combined the oval and the crown. The "Guardians" were made by a variety of manufacturers in the 1880's and 90's, most did not bother to put their name on the guns, especially early on because Eugene Lefaucheux owned the patent in continental Europe for the bored-through pin fire cylinder - just like the Rollin White situation in the US. If yours does not lock up, this could be because either the cylinder stop / trigger return spring is missing or broken (very common problem) or the actual stop is damaged (not common). The "Guardians" fall into the same category as the US "Suicide Specials" as far as quality goes... Good luck!