Hello list, I have had a large (~6"x6"x6") and heavy (23 lbs) choke kicking around for quite some time. It's marked Ferrodyne 13821 and 14405 and has a date code of 7714. Couldn't get a reading on my ZM-11, so it is probably larger than 10H. Does anyone have a clue what this came out of or what its rating is? 73 Lee WB6SSW