Re: New to me Model 93 WMR
E-Series rifles refer to certain centerfire 110's and has nothing to do with rimfires. Not sure who (if anyone) has rimfire serial number records, but it's lower than both my 17HMR and 17 Mach 2 which were bought straight from Savage in 2004 and 2005. My guess would be somewhere between 2000 and 2004.
Re: New to me Model 93 WMR
While E-series doesn't pertain to the model designation of rimfire guns, there is a newer E receiver on the bolt action rimfires that is distinguishable from older receivers by its length. Older receivers measured 7.25" OAL, while the E receivers measure 7.75" OAL.