To be honest I have no idea - all my inherited coins came in a sackcloth which had been kept in garages, cellars for the last 100 years. To me it looks like the penny has been deliberately defaced to use as a test for the dies as you say.
I base that assumption on the fact that Ashton changed their name 1851 and Barlow seems to have exported knifes around 1750 and seems to have changed names to Barlow Bros by 1823.
I base that assumption on the fact that Ashton changed their name 1851 and Barlow seems to have exported knifes around 1750 and seems to have changed names to Barlow Bros by 1823.

























