Here is a great line-up of porcelain spools -- actual postage additional:

1) black inkstamp LORENZETTI MADE IN BRAZIL, VNM -- $3.00

2) unusual shape, no markings, great drippy light blue glaze! -- VNM -- $8.00

3) unusual style, inkstamp M over E, small chip, -- $5.00

4) another unusual style, drippy light gray glaze, VNM -- $8.00

5) Large spool, unmarked, light gray glaze, VNM -- $8.00

6) Large spool, 52 on base, blue-gray glaze, VNM -- $8.00

7) Great gray glaze! two chips on back one on front, -- $5.00 (SOLD)