Perforation
1d Die 1, Plate 74, curious perforations (Simpson) [L] 48(3)70
1d Plate 10, experimental (Jackson) [N] 48(4)89
1853 Government trial (Lajer) [N] 37(5)99, (Simpson) [M] 38(1)6, (Sargent) [M] 38(3)46
Archer‑perforated stamps, Plate 91, discovery (Simpson) [M] 48(1)4
— Plate 94, Gladstone to Disraeli cover (page numbered 48 in error) (Forbes‑Nixon) [M] 47(4)96
— Plate 108 on cover (Kibby) [M] 50(6)129
— Plate 111, new discovery (Simpson) [S] 48(4)81
— Wilkinson and Hill punch sets (Escott) [L] 52(4)77
— distribution and usage (Simpson) [L] 47(1)14, (Burgess) [M] 47(2)47, (Simpson) [M] 47(3)63
— distribution and usage, update (Simpson) [L] 60(1)1
— from Plate 95? (Williams) [L] 57(1)4
— number of recorded covers (Simpson) [L] 52(2)25
— on cover (Simpson) [M] 52(5)97
— statistical analysis (Chadwick) [S] 52(4)75
— unrecorded document (Simpson) [L] 55(6)134
Archer's first machine — interpreting the evidence (Simpson) [M] 59(2)25
Archer's rouletting machines, response (Escott) [M] 59(1)1
Archer, first roulette fingerprint (Escott) [M] 57(5)100
— post‑trial plates (Simpson) [L] 45(6)139, (Simpson) [C] 46(1)3, (Simpson) [M] 47(2)45
— rouletting machines (Simpson) [L] 58(6)139
Book review, Stamp Perforation: The Somerset House Years 1848 to 1880. Simpson & Sargent (Dagnall) [R] 45(4)88
Clipped sides, stamps with (Pusterla) [S] 43(3)55
Combination covers, imperf. and perf. (Simpson) [L] 46(6)123
Crisis in 1879 (Simpson) [L] 37(1)14
Double‑sheet perforation (480‑set) 1911/1912 (Jackson) [L] 61(4)86
Downey Head, emergency perforation of panes in books (Harvey) [L] 59(2)28
Extension holes missing, QV line‑engraved (Hollins) [M] 56(6)136
Gauge 13½ x 14 on KEVII ½d (Pusterla) [S] 49(6)142
Gauge 16, survey of C11 (Stockdale) [L] 55(6)121
— use of in 1857-58 (Escott) [L] 53(6)124
Grover & Co. Ltd, close of (Wilkinson) [M] 40(1)18
Joyson, William, label on perforated wrapper (Jackson) [M] 47(5)120
KGV 1½d (Jones) [S] 31(2)35
KGV Photogravure low values (Gowland) [L] 46(1)18, (Gowland) [L] 46(2)40, (Gowland) [L] 47(1)4
Line‑engraved perforation (Barrell) [N] 24(3)34
Line‑engraved, quadruple on Plate 225 (Taylor) [M] 39(1)16
Machine, 1875 continuous feed experiment (Simpson) [M] 55(2)25
Misaligned pin on 1980 Conductors 15p (Jackson) [M] 41(4)79
Missing pins, a notation for (Simpson) [M] 32(4)61
— on Penny Reds (Maushammer) [M] 31(2)31, (Madden) [S] 31(2)40, [C] 31(3)53
Napier machines, modifications to (Simpson) [M] 36(2)38, (Jackson) [C] 36(3)53, (Wiseman) [S] 36(3)54, (Simpson) [M] 36(3)55, (Wiseman) [S] 36(6)115, (Simpson) [M] 37(1)14
New perforator on Surface Printed issues (Wiseman) [N] 32(3)58
Official, first date of issue? (Sargent) [N] 36(4)80
Officially perforated stamps, intoduction of (Simpson) [L] 56(4)79
Perf. Type 3 with no extension hole, KGV Photo. 2d (Jackson) [S] 53(6)123
Perforation, 1880–1901, a fresh look (Simpson) [L] 57(1)9
Pierced margin on KGV Photogravure (Russell) [N] 34(1)6
Pinning marks, 1d Die 2, Plate 1 (Wylde) [M] 56(5)112
Pinning points, position of (Wiseman) [S] 36(6)116
Plate 170, Treasury Roulette on cover (Newroth) [L] 57(5)97
Plate 171, Treasury Roulette on cover (Newroth) [L] 57(5)97
Roulette, on Wembley roll stamp (Griffin) [S] 29(2)27
— serpentine ('Treasury'), Plate 163, addition to Statham (Batty) [S] 48(1)23
— — Roulette, serpentine ('Treasury'), discrepancies in NPM collection (Madden) [M] 31(1)11
— — Roulette, serpentine ('Treasury'), fingerprints (Escott) [L] 54(6)130
Scissor‑cut Penny Stars (Jackson) [S] 58(2)39
Somerset House, dividing sheets (Simpson & Sargent) [L] 44(1)12
Type 2 perforator, on photogravure issues (Gowland) [M] 48(6)139
Wing margin, unusual (Louis) [M] 34(1)14
Wing margins (Escott) [M] 49(5)117