Manufacturer and/or Distributor: Post Office / Government

Grade 3

Hobbs, ratners, Withers (1908 – 1945)

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Grade 2

Chubb, Cox, Ratner (1908 to 1966)

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Grade 1

Chubb (1953 – 1966)

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Grade 1a

Tann Fortress, Cox (1966 onwards) – Tetsed at BRE

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SPO Sub Postmaster

Stratford (equivalent Clarendon)

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SDP

SLS (equivalent 1500)

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Euro Grade F

Euro Grade 4, Chubb, Dudley, Robur, Rosengren

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Euro Grade T

Euro Grade 3, Chubb, Dudley, Robur, Rosengren

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Euro Grade W

Euro Grade 2, Chubb, Dudley, Robur, Rosengren

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Euro Grade N

Euro Grade 1, Chubb, Dudley, Robur, Rosengren

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