I had one almost identical to this- same size, but mine was (almost) red, same seized stem.
I turned it upside down, sprayed motorbike chain lube into the fork crown so it soaked the stem/fork interface and left it overnight.
Next day turned it the right way up, block of wood on the stem, BIG hammer, no more seized stem.
One hell of a lot of rust on the stem when I pulled it out.
Needs an inverse shim for most modern seatposts also.
@Dammit started
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I had one almost identical to this- same size, but mine was (almost) red, same seized stem.
I turned it upside down, sprayed motorbike chain lube into the fork crown so it soaked the stem/fork interface and left it overnight.
Next day turned it the right way up, block of wood on the stem, BIG hammer, no more seized stem.
One hell of a lot of rust on the stem when I pulled it out.
Needs an inverse shim for most modern seatposts also.