hi all, bought a mk1 a while back ,perhaps someone more knowledgeble than me could help me date it please..it has black slant grips and is blued and .177 cal..markings on left side are WEBLEY AIR PISTOL MKI......MADE IN ENGLAND and OIL HERE in the normal place and 60966[serial number?] ....right hand side markings are WEBLEY&SCOTT LTD BIRMINGHAM [no number 4] and several patent stampings..trigger is ajustable and premier shaped..trigger guard is wider than a premier..there are no stampings under the grips. my guess is somewhere between 1958 and 1972.i know these things are easier with a photo but my son is not here and i am a dumbo at such things,any info would be much appreciated...cheers..greasemonkey