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It's a 6910. Just one of the old ones when Sunbeam were using an array of steam pumps before manufacturing with the blue Jiayin pumps.
For re-installation of the new pump, you don't need to disassemble any part of it. You also don't need to cut the rubber mount. Every time I see a machine with a cut mount it annoys me, it's so easy to change the pump without touching anything.
You'll see on the upper mount that the hole is a teardrop type shape. You first angle the pump and insert the pressure relief nozzle through then straighten up the pump whilst pushing gently upwards. The whole upper part of the pump will slide into place in the mount.
You'll need to do some wiggling to seat the copper line on top again but that's about as difficult as it gets.
You will also need to replace the o-ring on the copper line. It has perished and caused a water leak down the pump, creating the rust you can see and eventually killing the pump altogether.
I don't know the measurements of the o-ring off the top of my head, I just use a silicone o-ring when I do it from my stock. Measure the OD of the copper line and the ID of the top of the steam pump and this will be roughly the size you need.
Make sure you get a silicone or Viton o-ring, a regular rubber o-ring will perish rapidly.
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