It's what we call the small journal crank. Nothing special and no need to remove the flywheel before it goes to the grinders. All points made in previous posts are extremely valid, Service sheet 207 (available in Literature Section) gives journal regrind sizes. Print off and show the machinist. For big end journals you have to grind to available replacement bearing shell sizes, Standard less 40 Thou down is the smallest I have seen, so at this point the crank was considered scrap (in times gone by). These days well worn cranks can be recovered by metal spraying, but here the costs soon mount up.
The above link shows the removal of a tubular sludge trap found on the later big journal crank. Small journal cranks have just a simple oilway drilled to join the big end journals, Both types have a small bore oilway leading up from the timing side journal.
Does it actually need a regrind? Wear limit is 2Thou ovality, and unless the journals are scored or with obvious signs of wear most shine up OK. Yours look pretty good from here.
There are plenty of replacement shells around, but maybe not from the grinder's usual trade supplier. You may have to source these yourself.
Make sure the grinder polishes the crank journals after grinding and also removes the razor sharp edge to those oil holes. A clinical clean before assembly is down to you. Lots of horror stories already on the Forum about crank grinding. Sleep Well.
Swarfy.
