It was used as a buoyant body to float the rope when fishing for herring. 【Note】 This is an authentic glass float that was actually used in fishing
Antique and Vintage Fishing Floats and Bobbers
Set 6 Japanese Glass Fishing Floats Antique Vintage (2.9-3.3) Net,Blue Green
Japanese Glass Floats, Old Fish Net Buoys, Vintage Floats Once Used by Fisherman in Japan, Assorted Sizes, Mix of Aquas & Greens - Canada
Fishing Nets & Floats, Maritime, Antiques - PicClick
Set 7 Japanese Glass Fishing Floats Antique Vintage 2-sizes (3.3-2.7)
Japanese Glass Float - Canada
Japanese Glass Float - Canada
Japan Antique Original Antique Fishing Floats for sale
Antique Japanese Wood Fishing Floats - Set of 7
Japanese Glass Float - Canada
Japanese Glass Fishing FLOATS 2 LOT-7 Multi-Hued Netted Antiques!
Antique Japanese Wood Fishing Floats - Set of 7
Japan Glass Antique Fishing Floats for sale
EXCELLENT+++++】 JAPANESE FISHING glass floats 3.3in Otaru
Set 6 Japanese Glass Fishing Floats Antique Vintage (2.9-3.3) Net,Blue Green