Here is a Dbl barrel ML that has been in my family for 5+ generations. If you can tell any more info on date/country of origin, that would be great. I do know it is a twist steel barrel.
20180731_180157[1] by Mike, on Flickr
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20180731_180544 TOP by Mike, on Flickr
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20180731_180535[1] by Mike, on Flickr
20180731_180157[1] by Mike, on Flickr
Top:
20180731_180544 TOP by Mike, on Flickr
Side
20180731_180535[1] by Mike, on Flickr