Unfortunately, since as you say it isn't the original stock then the Weedon repair stamp or lack thereof on the bottom of the pistol grip is meaningless. As for it being a MkI, not a MkI* if the * is lacking above the serial number then it could be a MkI.....if it isn't a scrubbed MkI* masquerading as a MkI. The only surefire way to tell in this case is to measure the the left locking lug recess of the barrel. If its .050", it's a MkI barrel, if it's .10" deep it's a MkI*. As to value, a mismatched stock and bolt greatly reduces its value. In this case, it appears to be an overstamped Winchester bolt. Winchester bolts have their serial number stamped on top of the bolt handle, Remington and Eddystone are stamped on the bottom of the bolt handle.