Table 2

Notes:
2.1 Mackay starts Austrian airmails with the 1922 republic stamps designed as airmail (C4, SG546 40p / £1.50). Scott and Gibbons go back to 1918 overprints of monarchy stamps.
2.2 This is clearly one I will never acquire. The illustration from SG is of the 12c black on blue SG5 which sells for £5,000 / £1,900. This also features on the 1979 Guyana SoS issue. Most of the stamps from 1851 o 1867 are of similar designs, the first sensibly priced (FSP) stamp is the 1869 1 cent black. This is the first of a feature I will apply to the site on the second pass.
2.3 Scott #1 (SG14), the  4pf green was issued in 1856 (£65 / £24). The first stamp, Sc2 (SG4) was 1850.
2.4 The first 'real' Spanish airmail stamp was the 1929 Sc-C6 SG515 5c brown (£4.50 / £4.25).
2.5 Mackay lists the first Spanish charity stamp as 1938, presumably the Republican issue 45c +2p with a surtax for the defenders of Madrid (Sc-B106, SG839, 50p / 50p). Scotts first semi-postal, Sc-B1 SG394 is the 1926 Red Cross 1 c black issue (£1.60 / £1.60).
2.6 Scott's first Swiss airmails SC-C1,2 are expensive and frequently forged overprints (C2 of 1919 predates the C1 of 1920). They are SG 302 and 303,  priced at £100 / £1,100 and £30 / £95 respectively. I am happy to go with Mackay on this occasion.
2.7  removed
2.8 Scott Classic and Gibbons Simplified both list Schleswig-Holstein (Sc1-7, SG2-10), then Schleswig (Sc8-14, SG24-29), then Holstein (Sc15-25, SG51-67), numbering consecutively. Mackay treats the three entities separately.
2.9 For Switzerland Officials, Mackay and Gibbons start in 1918, Scott in 1938.
2.10 New South Wales #1 imperfect but decidedly cheap at $5.58 on eBay. Both Scott and Gibbons list many variations of the two plates in various shades on a variety of papers. There is no clear , so the best advise is to keep looking for a cheap 1 d red.

Table 3

Notes:
3.1 The first Canadian commemorative issue is the ½c black, priced at £48. The next in the series is the 1d orange (Sc51, SG122) at £8 and £2.75. I'll probably settle for that.
3.2 The Nova Scotia Sc1/SG1 is a 1d brown priced at £2,000 / £400. Scott shows this as issued in 1853, making the more reasonably priced Sc2/SG4 the first.
3.3 Gibbons' Trinidad #1 is the Lady MacLeod private issue for the shipping of stamps between Port of Spain and San Fernando. Scott mentions this but does not number it. Sc1, SG8, the 1 d brick red was issued in 1856, which brings us to Sc2, SG2 as the first issue.
3.4 I think this is an error in Mackay - the 1914 and 1915 Red Cross stamps were issued under Trinidad and Tobago which opened for business in 1913.
3.5 Denmark Sc2/SG4, 4 rbs brown was issued April 1, 1851. Sc1/SG3 issued a month later, May 1 and was a local stamp for use in Copenhagen. RBS means  rigsbank skilling, of which there were 96 in 1 rigsdaler. The FDC of Denmark's first stamp is from an auction on 24th March 2007 at Swedish auction house Postiljonen: the starting price was €60,000.
3.6 Tuscany SG1 (£4,000 / £900) is the 1q black, but Scott, although making this the Sc#1, dates this an 1852 issue. Sc#2, 1851, 1 soldi ochre, is probably SG4 (£ 6,000 / £1,200). This is interesting but academic as, at those prices, I will not be pursuing either. The most reasonably priced stamp of the set is the 2 crazie blue - same design, same year, so that's the one I bought.
3.7 Identification of Würtemmberg's first Official is rather messy. SG-O181, 2pf grey is Sc-O1, but dated 1900. Similarly, SG-O182, 2½pf grey, is Sc-O2 but dated 1896. That leads us to SC-O3, SG-O112 but dated 1875 by Scott.
3.8  A Canadian Beaver is essential in any first issues collection. One of the 1852-1857 shades on handmade paper is about as good as a #1. Failing that the perforated 1857 5c version will suffice.
3.9 For Sardinia, in addition to the FSP, it is probably worth looking out for inexpensive used copies of the 1851 20c blue (Sc2, SG3 or Sc2a SG4 deep blue) as these share the same design as the #1 and catalogue at around £90.