What Adding a Fake Grill Does to the Value of a Stamp

Skilled tool and die makers can make a device to add a grill to a more common stamp. It is best to have all valuable grilled stamps expertised.

Stamp

Value 

Grilled Version

Value 
(used) (unused) (used) (unused)
63 $32.50 $325.00 85A $935,000.00

?

      86 $450.00 $2,750.00
      92 $200.00 $1,000.00
65 $2.50 $130.00 79 $1,100 $5,000.00
      82 $175,000

?

      83 $950.00 $5,000.00
      85 $950.00 $6,000.00
      85C $3,200 $12,500.00
      88 $22.50 $800.00
      94 $7.50 $360.00
68 $50.00 $750.00 85D $90,000 $90,000.00
      89 $300.00 $5,000.00
      96 $200.00 $2,500.00
69 $90.00 $1,250.00 85E $1,500.00 $11,000.00
      90 $350.00 $4,500.00
      97 $225.00 $2,800.00
70 $175.00 $2,000.00 99 $850.00 $5,500.00
71 $160.00 $1,600.00 81 $60,000

?

      100 $700.00 $5,500.00
72 $425.00 $2,750.00 101 $1,400.00 $10,000.00
73 $50.00 $350.00 84 $3,000.00 $15,000.00
      85B $1,100.00 $7,000.00
      87 $140.00 $1,400.00
      93 $47.50 $475.00
76 $1,200.00 $110.00 80 $130,000

?

      95 $750.00 $3,000.00
      105 $2,900 $2,750.00
77 $150.00 $1,750.00 85F $220,000.00

?

      91 $625.00 $8,750.00
      98 $300.00 $3,250.00
145 $15.00 $475.00 134 $140.00 $2.00000
146 $9.00 $325.00 135 $70.00 $1,200.00
147 $1.50 $300.00 136 $19.00 $725.00
148 $25.00 $675.00 137 $525.00 $4,200.00
149 $90.00 $850.00 138 $425.00 $3,000.00
150 $20.00 $725.00 139 $650.00 $4,750.00
151 $160.00 $1,750.00 140 $3,000.00 $21,000.00
152 $160.00 $1,900.00 141 $1,200.00 $5,500.00
153 $140.00 $1,500.00 142 $6,500.00

?

154 $190.00 $5,000.00 143 $2,400.00 $14,000.00
155 $300.00 $4,000.00 144 $1,600.00 $13,500.00
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