Featured Help please! Era made and is this manganese glass?

A neighbor was cleaning out an outbuilding and gave this bowl to me...covered in dirt and mud. It is unbelievably heavy weighing 8.4 lbs! Not clear glass as pics show but kind of a grey/lavender in the sun. It glows purple under blacklight with pale green along the seams and tips. 6 1/2" tall and 12 1/2" wide at top. I believe it may be manganese glass which would make it quite old.

Any idea as to era made and does it have any value. No chips or cracks..a few bubbles. If more pics are needed..just let me know.

Thanks in advance!

 

Those daisy/sunflower designs are usually sixties ish.

 

maybe Blenko 'Bounty Collection' c1976

page 7
Blenko Glass Catalog 1976.pdf - Google Drive

also 1977 page 7
Blenko Glass Catalog 1977.pdf - Google Drive

Set Of 4 1976 Blenko Sunflower 6.25" Salad Bowls (Clear W/ A Light Blue Tint) | #3915879126 (worthpoint.com)

 

Thank you so much! You were spot on..it's Blenko from the 70's! I figure it's been left out in the sun since it now has a lavender tint and is no longer crystal. Now to decide whether to keep it or try to sell it.

Thanks again, Judy

 

It's very pretty. Good luck!