Limited numbers of aircraft were produced during the late 1940's and 1950's. Plans went on sale in 1962 and many homebuilt aircraft followed, including 8 homegrown S 1's in New Zealand (to date).
The original S1 was followed by the S 1C which was amatuer built and had 2 ailerons, the S 1D with 4 ailerons, the S 1E had symmetrical airfoils and the derivative S 1F had the Falcon wing modification with square wingtips and larger ailerons. The S 1S was factory built for competition and the S 1T was factory built with a 200 HP Lycoming motor.
The photos are from the Keith Morris collection unless otherwise noted.
New Zealand's first Pitts Special was ZK-DOH (c/n AACA/121) which was started in Hamilton (Hamilton was a hotbed of early Pitts Special activity), but was completed by Chris Pask of Hastings. It was a S 1C model with ailerons only on the bottom wings. It was first registered on 11/1/76 and it is photo'd here at the 1976 AACA flyin at Kaikohe. I remember my first sight of it when it took off obscured by other aircraft and rocketed into the sky! (This was in the time of Turbulents and Jodels). One neat touch added by Chris Pask was the embossed leather patches on either side of the cockpit.
ZK-DOH was sold to Peggy Perry of Hamilton on 29/3/78 and it is shown here at the 1983 AACA fly-in at Paraparaumu. It was then sold to Dennis Thompson International Ltd in 1983, who sold it to W Sneddon of Nelson on 9/5/84, and it was then sold to R E Turner, also of Nelson, on 12/11/84.
It was then sold to Moss G Smith of Puriri near Thames on 8/9/89. It is photo'd here at the 1990 AACA fly-in at Waipukurau. It was damaged at Taupo on 20/2/90.
Moss Smith was a very keen aerobatic pilot and he rebuilt ZK-DOH as a S 1F model with the Falcon wing conversion as photo'd here at the NZ Aerobatic Championships at Waipukurau in 1991. It was finally sold to M R Smith of Inglewood on 24/10/95, and it was withdrawn on 1/7/02. 
Our second Pitts Special has an interesting story. ZK-ECO (AACA/337/1)was commissioned by Tim Wallis and was mostly built by Bob Goding at Hamilton, and it was registered to him on 20/11/75. It was completed by Drake Aviation and was first flown on 1/5/83 by Keith Trillo (who had also built a Pitts). It was an S 1E model with the 4 ailerons. I do not have a record of who took the above photo or where it was taken (later advice that the photo was taken by Greybeard), but it must have been early on in its life as it does not have the Pitts Special logo on the tail.
Sadly it only flew a very few hours before being involved in a fatal accident on 24/5/85 while undertaking low level aerobatics at Beacon Point near Wanaka, killing its pilot (see comments below). The wreckage was returned to Hamilton and it was cancelled on 30/3/88. Thanks to Bob Goding for this photo (after a lot of tracking down).
But this was not the end of ZK-ECO! It reappeared again at Hamilton with a new constructors number (AACA/1061) after having been rebuilt by E C Roberts, and it was re-registered on 19/2/90. It was finally cancelled from the New Zealand register on 26/4/04 when it was sold to the UK as G-CCXK, where it is still current and painted in the same colours. Thanks to Philip Treweek for the above photo which was taken at Rukuhia on 24/8/97.