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I just purchased this Waltham pocket watch ($10) Would this watch be an early 1900s or late 1800s pocket watch. I am about to service this movement. Could this be an W.M. ellery movement from the late 1800s. Its 15 jewels the serial number is 20358779.

Looks correct apart from the movement @ ranfft has not got shock spring for the balance. Good spot wls

Cupillard 233 I think check Cupillard on the ranfft site.

I don't think you have room to machine a square/slot etc - it looks like the top of the milled surface is the underside of the t slot overhang. So what about making two strips the right width and thickness and with countersunk screws fasten them into the existing threaded holes....sort adding back what was milled away?

I use a piece of rodico to stick the pallet fork to the upper plate, then remove it after assembly. I do a lot of pocket watches. Sent from my GT-N5110 using Tapatalk

7t42-7a2a on a new non Seiko padded black leather strap.

Saved this in my computer. For some day when i or someone else could have some use for it? https://www.ebay.com/itm/Vintage-Omega-Mega-Quartz-Watch-Cal1310-1315-Coil-Rewind-Repair-Service/192348393486?_trkparms=aid%3D222007%26algo%3DSIM.MBE%26ao%3D2%26asc%3D49476%26meid%3D367dedf4c2954d2ca89d900be354f7e1%26pid%3D100005%26rk%3D3%26rkt%3D6%26sd%3D222690958158&_trksid=p2047675.c100005.m2219 if they could rewind a 1310 they could maybe rewind a 1220 also?

The "trick" to most full plate 18s watches in disassembly and reassembly is to do it upside down. Once you remove the balance and mainspring barrels, remove the plate screws and invert the movement in your holder. Carefully separate the plates, teasing the pivots from the jewels/pivot holes. The pallet actually sits partially inside the lower balance jewel cock. Reassembling is the reverse process.