Thank you for your post and kind offer of photos.
The Premiers were not serial but batch numbered, as has been discussed near the start of this thread. Unfortunately the Premier Mk 2 did not appear to have been date coded and it is not possible to date a specific pistol from the batch number alone. The Mk 2 was only made for a short period of time but there are differences to look out for, which point to early or late examples; such as the presence or not of a barrel shroud behind the muzzle. The knurling on the barrels differed too.
Kind Regards,
John