Your mower appears that it may be for a "front-mount" mower unit.
If you go to https://partscatalog.deere.com/jdrc/ and type in "60" and look at some of the resulting front-mount (or other) mower decks you can probably figure out what you have.
Finishing mowers typically operate with a blade tip speed of around 17,000-19,000 feet per MINUTE.
To achieve the lower end of that range your spindle speed needs to be around 3100 RPM's IF my math is correct, DISCLAIMER: better double-check it and triple check it and rely on your own math!
The math:
21" bade diameter X 3.141592 pi X 3100 RPM's / 12 inches in a foot = 17043 feet per minute.
So if your tractor's belt pulley shaft that you are sourcing power from turns 1280 RPM's you need a speed INCREASE of at least 1 : 2.42 between the tractor and mower.
Also, for everyone's safety, GOOGLE "finishing mower blade tip speed" to verify that the 17,000 to 19,000 feet per MINUTE is correct.
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Today's Featured Article - Chores - by Frank Young. The ceaseless passing of time! It is at once our friend and our enemy. It measures our progress and it makes us old. Like most features of our life, few things are all good or all bad, and most such judgments depend on our own perspective or viewpoint. In our particular hobby, we enjoy the nostalgic return to the days of our youth as we recreate many of the scenes that took place on the family farm that served as the stage for the first few acts of the play that is our live
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