if
this is the auction then it is a great buy especially if you get it for around the $80 +pp = ~$88
it is not the XS model as the XS model has a smaller diam end to the barrel onto which the cap is meant to be posted to make it a more usable length for use... this is the original versionof the Ecridor Retro without the same smaller diam end to the barrel like the XS...
this one has the end of the cap and the barrel the same subtley domed end... where as the later version has a short section at the end of the barrel that is of a smaller diam for posting the cap
this pen with a posted cap would to unbalance in my opinion as the Ecridor is a somewhat heavy pen for it's size being solid brass base metal which is then coated.
if this is the pen I think it is it is then the one which is silver plated (therefore will tarnish) as the model I spoke of above with the smaller barrel end for posting the cap came only in rhodium plating over silver plating.
I have the silver plated earlier version as I much prefered the subtle silver colour rather than the more shiny chrome look of the rhodium plated and had to get the distributer here in Oz to source one for me... pit I could not at the time strech to get the gold nib (rhodium plated) rather than the stell nib version... altho the pen is a magnificent smooth writer and i definitely did not have to "break-in" the nib at all... and mine is the XF... as I said a little heavy but VERY nicely balanced in my hand... but would not be so if posted (which my version can not be)
the silver version... do not know about the rhodium plated version... does suffer considerably from scratching on the section from the edge of the cap lip when the pen is capped and un-capped... to the extent that I lined the inside edge of the cap with clear tape (a real pain getting it in just right)
over all tho... I love my Ecridor Retro... my most expensive pen still... I had to pay over AU$300... as I got it before discovering eBay where you can get them for 1/3 of what I paid... to the extent that I would love to get another as a take everywhere pen since the one I have I tend to be a little precious with it
cheers
Trevor