Looking for date of manufacture and stamp help

[CINDERS]

If it has been through a field workshop or infact a FTR the armourers were not interested in matching allot of the ancillary parts like the bands but grabbed what was there and plonked them on perfectly accepted practice I have been looking at Strattons book but will wait for others to chime in to answer the DOM question any markings on the barrel at the knox form may be able to get some dates of there. Pictures are also good for the knowledgeable crew here plus we all like to look at them.