From your photos, this looks like an older low-profile hydraulic transmission jack with four casters, an adjustable/tilting saddle, and retaining straps. The identification label is badly worn, so I would not claim a brand or exact capacity unless you find another readable tag somewhere on the jack.
For comparison, new low-lift transmission jacks are currently around $110–$130 for 450-lb models, while heavier 800-lb models are around $240. Harbor Freight’s current 450-lb low-lift transmission jack is $129.99.
Looking at yours, it is clearly used and has scratches, dirt, and surface wear, but the saddle, wheels, and straps appear to be present. If you don’t know whether the hydraulics lift and hold properly, I would advertise it as untested.
I would start at $75 OBO. If someone confirms that it lifts and holds correctly, I think $75–$100 is reasonable. Untested, I’d expect more like $50–$70.
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Used Hydraulic Transmission Jack – $75 OBO
Used low-profile hydraulic transmission jack for automotive transmission removal and installation.
Heavy-duty steel construction with rolling casters, adjustable transmission saddle, and retaining straps.
• Low-profile design
• Hydraulic lift
• Adjustable/tilting transmission cradle
• Four swivel casters for positioning
• Retaining straps included
• Heavy-duty steel construction
• Used condition with normal scratches and wear
The original identification label is worn and difficult to read, so I am unsure of the exact brand or weight capacity.