Topic: Appealing piece of Studio Glass Fizzy Bubbles For the Purists :)))

[LEGSY]

A very pleasing piece of studio glass have not been able to find out who
made this one but maybe of German manufacture but nothing firm
would love to get others opinions on it please. The glass has a well polished
pontil scar, It has a thick wall with a trailed line of bubbling which goes right
around the bowl a few times the background has some other red and yellow
colorings really attractive and feels well made by someone :)4 3/4" x 2 1/2".

[LEGSY]

more pictures

[chopin-liszt]

Very mysterious indeed. 
Are there tiny black particulate bits involved around the bubbles?

[LEGSY]

Hi ye some places around where they clump up together the bubbles there is a dark sludgy stuff
in the places where the bubbles touch together yes but wouldn't say tiny so much maybe similar to what you
are saying though hard to describe really thank you for replying.

[chopin-liszt]

The bubbles are not unlike some of Peill and Putzler's Shleiergraphit, but I can't find any images to post. 
The bubbles in Schott Zweizel pieces do not have black particulate matter but are possibly more like yours than most P&P.

[flying free]

There is this item with spiral bubbles with an Eisch label but I honestly have no idea if it might be Eisch. 

https://i.ebayimg.com/images/g/WO0AAOSwEJdflM-H/s-l1600.jpg

https://www.ebay.co.uk/itm/143805032099?chn=ps&norover=1&mkevt=1&mkrid=710-134428-41853-0&mkcid=2&itemid=143805032099&targetid=293946777986&device=c&mktype=pla&googleloc=9045619&poi=&campaignid=17116423086&mkgroupid=134652533165&rlsatarget=pla-293946777986&abcId=9300856&merchantid=549703706&gclid=EAIaIQobChMIxseehfqC-AIV4IBQBh1DjQiMEAwYAiABEgL-0_D_BwE

Also Poschinger did some curious 1970s (? I think)  stuff with trailed spiral red but there were no bubbles.  I have a vase somewhere but your bowl seems much more appealing.  Just mentioning it because of the spiral effect really.

[LEGSY]

Really appreciate the time taken to reply thank you.