When I saw this cancel on eBay I did not recognize it. Although at first sight it appears that the Delft cancel is a roundcancel, well see that well have to assume that in reality it is a combination of a worn round (date) cancel and an old straightline cancel.
After the bidding closed I contacted the buyer and asked him about the history of this cancel. The buyer put me on the right track, by pointing out the literature where this cancel is mentioned. In chronological order this is whats written about it.
Vellinga1 (1933) writes: Through Circular # 528 of February 13, 1857 it was pointed out that the use of cancels, not previously approved by the postal authorities and used at some postoffices, were not allowed. Known are cancels (Vellinga type 41 (V 41)), of Amersfoort and Delft.
Korteweg2 (194?) : February 13, 1857. Ban on the use of fantasy products. Only officially supplied cancels can be used by postoffices.
Korteweg then shows Korteweg type 46 (K 46), which is reproduced here.
In 1955 van der Willigens3 publication there is a chapter on Falsifications. It shows two examples of the Delft cancel; one on the 5 cent 1852 issue, the other one on a 25 cent Wilhelmina fur coat issue.
Van der Willigen writes: A rather common combination is that of a normal cancellation together with a fairly large straightline cancel DELFT. This is probably the just in 1829 renewed straightline cancel (V 21) that shortly thereafter was replaced by the first date cancel (V 25). Contrary to sub postoffices (hulpkantoren) the main postoffices were not allowed to use this type of cancel. I have not seen it as the only cancel (not in combination with another cancel) on a stamp of the first issue or on a cover. Strangely quite a few stamps of the fur coat issue (1898) and some of the Jubilee issue (1913) were canceled with this postmark, which gives reason to believe that during the period 1913-1915 this cancel was put into use again, mainly to be used on packages, and other mail with an irregular surface. For this type of mail it was mandatory to cancel the stamps using some straight line cancels. We assume that during that period a postal employee saw a chance to make some money by applying this rare cancel to the first issue.
Hoogerdijk4 also shows the cancel, with the following text: The old straightline cancel Delft was used for packages around 1915. Value is fl 25 on the fur coat and Jubilee issue. This cancel is most likely also used on stamps of the first and second issue.
Specialiteiten Catalogus5 notes: On all three denominations of the first issue one can find the straightline cancel (K 46) DELFT (with Egyptian ( with serifs) lettering). Van der Willigen (1955) is of the opinion that we are dealing with a falsification. Although Korteweg, in his publication gives it its own number (K 46), but that refers to the ban on fantasie products. K 46, for the same reason could listed under K 15, K 19, K 27, K 30A(cut), or K 41. Because DELFT is mainly found in combination with halfround cancels situated along railroads, it makes sense to think that we might be dealing with some type of railroad cancel. The value varies from 250 Euros for a combination cancels on the 5 ct and 10 ct denominations up to 500 Euros for combination cancels on the 15 ct. denomination and 5 ct and 10 ct only DELFT (not in combination with another cancel).
Well, there you have it. What can we conclude?
To me it appears that we are dealing with a real cancel, used originally around 1856/57 and later put into use again, possibly legally to cancel the fur coat and Jubilee issues, but illegal to cancel the stamps of the first issue.
1: O.M. Vellinga, De Poststempels van Nederland, 1676-1915, NBPV , 1990 Reprint
2: P.C.Korteweg, 300 Jaar Postmerken van Nederland, 1570-1870, NBFV, 1985 Reprint
3: A. van der Willigen, Afstempelingen Emissie 1852 van Nederland, Uitgeverij Davo, Deventer, 1955
4: D.C. Hoogerdijk, De Naam- of Langstempel van Nederland, Uitgeverij De Munnik, s Gravenhage, 1972
5: Specialiteiten Catalogus 2006-2011, NVPH, 2006
With thanks to Martin Bos, Wageningen, the Netherlands