Miller, this one in the tiny url somewhat resembles your Thalson except it appears to also have the roll crimping ability judging from all the parts displayed. Nice looking shot/powder dippers accompanying it. All yours for the bidding. wink

https://tinyurl.com/y24pufyk
Here's an unusual in design 20 ga. roll crimper made by the Ideal Mfg. Co., New Haven, CT. The head holder slides down on the two rails applying pressure to the crimp. It's a slick little rig and makes a beautiful crimp. I've used it (and others) on my 3" turkey loads. The third photo has patent info and perhaps a date. 20 ga. RTO's are rare in comparison to 16 and 12. 28 ga. and .410 more so. I've noticed a revival of interest in the old crimpers beyond collecting from turkey hunters wishing to handload shells. These Armstrong powered crimpers make as nice a crimp as can be made regardless of tool used or technique employed. Gil