[SEL] Nationional engine

[Arnold Laird]

Can anyone help with a year of manufacture for this National Engine Model "M" No 241.

A friend found this engine buried in a creek recently.
One fly wheel broken off and other bits broken or bent possibly by a dozer.Nuts are coming off easily but a lot of rust to be removed.
I do have pics but not too sure how to send them to the list
   The brass plate says     National gas engine co
                                     Bickerton & Bradleys Patents
                                     Ashton-under Lyne
   Thanks Arnie Laird