Peter Buder wrote:
Am 14.02.2011 22:02, schrieb Tony Clayton:
I am having a bit of trouble sorting out a recently acquired
Netherlands collection.

Using Stanley Gibbons Part 4, Perforations on the 1876-94 numeral
issue are given as:

12.5x12 (or 11.5x12) large holes
14 large holes (1877)
13-13.5 large holes (1877-89)
12.5 small holes (1884-87)
12.5 large holes (1889-94)

Now I have one stamp clearly 12.5x12 with a clear 1886 postmark
and other stamps that are clearly 12.5x13

I have had similar problems with the 1872-91 portrait of William III
issue

Does anyone have a specialist Netherlands catalogue that gives more
accurate
gauges?

Any help will be most gratefully received!

Hello Tony

in my specialized catalogue there are mentioned 6 different
perforations:

1877 line perf. 14
1877-1889 comb perf. 13 1/2 : 13 1/4
1876-1889 comb perf. 12 1/2 : 12
1876-1889 comb perf. 11 1/2 : 12
1884-1887 comb perf. 12 1/2 small holes
1889-1894 comb perf. 12 1/2 large holes


Hope that will help

It does in that it confirms the SG values.

It does not explain the 12.5:12 examples that I found, nor the 12.5:13
either, which leaves me puzzled.

It makes me wonder how accurate my brand new SG Instanta gauge is....

Thank-you for trying!

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Tony Clayton