I like Longines so I’m already halfway to liking it.
I have a few Admirals although most of mine are automatics. I find that the dials seem to be, generally, in better condition than other brands of the same age.
The one you’re interested in is classic and, without a date, can be dressed up or down and the movement looks clean, as I’d expect.
That said, it’s 'only' a manual movement (which is simpler and cheaper to service) and is on a strap rather than a bracelet so, if you decide to go for it, I’d offer less and see where you get to.
Don’t forget to factor in any VAT and/or import duty depending upon where you live.