Hi Phil, welcome to the forum. There is a lot of usefull information that can be found under the technical information section of the forum. Click on that link and click on markings. There you will find a photo essay that Ed created. Click on the link and then select the F-H section. Take a look at those photos and see if they match up with your suffix.
Sid.
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Sid.
Patience is a bitter plant, but it has sweet fruit.
~German Proverb
If it is made before 1930 ..........It is a prototype.
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