It looks as though it might be. Does it have a flat polished base? and difficult to tell from the image but glass colour?
One should be cautious of tagging everything made in Harrtil, by Harrachov, to Metelak. Certainly, three female designers produced designs in Harrtil. It is also the case that examples of Harrtil, were known to have been produced at the Chribska works, to designs by Ludvika Smrckova.