Unusual Model A Water Pump ID

[29As]

Hello,
Can anyone help me ID this water pump? It appears to have the same basic dimensions as a stock Model A water pump with the same four mounting holes. It has the following exceptions:
- The fan end is much narrower than a stock pump
- The grease fitting at the fan end is on top centerline, and not offset. It is also an "oil cup", not a grease fitting (not sure if that was once replaced or not) The front grease fitting is offset like on a stock pump.
- There is no packing adjustment nut
- The Impeller is different and looks "spring loaded"
I tried to attach a couple photos of this pump. Thank you very much.

[2manycars]

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