Oldham Local Militia - Interesting Backmark, Any Ideas Gents?

[Roy]

Hi Chaps,

Snowed in again up here in the Rockies, so a good day to catch up on some cataloging of recent additions to my Militia Button collection.

This gild beauty is a lovely Oldham (Lancashire) Local Militia example. The backmark is a crown over a wreath, anyone seen this before and have any ideas of who this mark belonged too?

Cheerio,

Roy