It looks just like any regular keyboard from the late '90s. It is about as generic-looking as you can get. It is likely to be a rubber-dome keyboard.
The only thing that sets it apart are that the LED windows are a bit high up. I think I might have seen that before but I am not sure.
IBM's Model M keyboards have different edges, a prominent IBM logo and did not have Windows keys (AFAIK). I think all buckling spring keyboards with Windows keys were made by Unicomp - in which case you would see Unicomp's logo there instead.
The IBM Model M2 has very narrow edges and also a prominent IBM logo.
If this is a keyboard you found on eBay or other auction site: Be aware that many sellers on eBay use the term "clicky" in a very wide sense ... so don't be fooled by that.
A serious seller should always post a photo of the label on the back of the keyboard. There should be the name of the manufacturer, model number or at least a FCC ID. With the last one, you could look up the manufacturer and model on-line.
BTW: "Membrane" refers to the contact mechanism in the bottom of many rubber dome keyboards. A membrane keyboard is not necessarily a rubber dome keyboard or vice versa. Rubber domes could be moulded in sheets, be separate inside or even glued to a membrane but rubber domes could also be backed by a printed circuit-board.