[rollei_list] Filter stacking question

A few weeks ago I posted a note expressing my frustrations in purchasing
a Rolleiflex F.  Since then, through a list member, I have been
successful in purchasing one and now am a very pleased Rolleiflex owner
with my new/old Rolleiflex F 3.5.

So far I haven't purchased any bayonet II filters (have a Rolleihood
coming though) but when I do I would like to stack them occasionally if
possible.  

Based on the photos of the standard Rollei filters that I have seen they
can not be stacked.  (No receiving lugs.)  

Not having seen even a photo of either a B&W or Heliopan Series II
filter I would like to ask if any list member who knows can tell me if
those filters are capable of being stacked?

Thanks!
Bob Eskridge

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