The vast majority of Gray's Pottery patterns was designated in one of two series:

The 'A' prefix appears to have been introduced in 1932 when, theoretically, 9999 had been reached - note that the highest four-digit number recorded so far is 9726. When A9999 had been reached, in about 1955, new series were introduced using a range of other prefixes such as: B, D and S.

Research shows that some pattern numbers had a suffix which, usually, indicates a colour variant of a basic design - see patterns A8515 or A9339 as examples. This practice appears to have started in the mid-1940s and continued throughout the 1950s. Note that this is different from a paintress' suffix which usually comprised alphabetic characters but which also, occasionally, was a number.

The conclusion of current research can be summarised as follows:

- using a four-digit number
- using the letter 'A' plus a four-digit number

The 'A' prefix appears to have been introduced in 1932 when, theoretically, 9999 had been reached - note that the highest four-digit number recorded so far is 9726. When A9999 had been reached, in about 1955, new series were introduced using a range of other prefixes such as: B, D and S.

Research shows that some pattern numbers had a suffix which, usually, indicates a colour variant of a basic design - see patterns A8515 or A9339 as examples. This practice appears to have started in the mid-1940s and continued throughout the 1950s. Note that this is different from a paintress' suffix which usually comprised alphabetic characters but which also, occasionally, was a number.

The conclusion of current research can be summarised as follows:

Patterns: Numbering system

Small quantities of patterns with other prefixes have been recorded but with little information and examples it is difficult to know how extensive these ranges were. They include:

C - five numbers known (C133, C511, C583, C655 and C1640)

F - three numbers known (F104, F113 and F131), both seen on William Kent figures. The 'F' may simply signify a figure.

K - one number known (K2059), on a 1950s stoneware casserole dish.

M - one number known (M1481) on a 1950s plate which exists as a boxed set with a small, matching ceramic-handled knife.

T - one number known (T225/5), on a square tile. The 'T' may simply signify a tile.

Y - one number known (Y9339), vine resist pattern on a yellow ground. A9339 is the same pattern on a white ground, so 'Y' may signify yellow.

C - five numbers known (C133, C511, C583, C655 and C1640)

F - three numbers known (F104, F113 and F131), both seen on William Kent figures. The 'F' may simply signify a figure.

K - one number known (K2059), on a 1950s stoneware casserole dish.

M - one number known (M1481) on a 1950s plate which exists as a boxed set with a small, matching ceramic-handled knife.

T - one number known (T225/5), on a square tile. The 'T' may simply signify a tile.

Y - one number known (Y9339), vine resist pattern on a yellow ground. A9339 is the same pattern on a white ground, so 'Y' may signify yellow.