None of the original cases made by Emmebi in Italy for Parker Reproductions that I've encountered have had "British Lever" anywhere on them. I would say the chances of yours being an original Repro case is very unlikely. If you can post a pic of it we'll tell you in a second if it's an authentic original Parker Reproduction case. Short of posting a pic you can go here, take a look at some of these cases and compare yours to them:
https://www.gunsinternational.com/gu...c716_p1_o6.cfm