早期M3背板上的一些玄機

C9.99

留意下果三個圓點，左邊果邊係屬於大約第1500部M3, 右邊果塊應該屬於再早d既，深淺度已經有唔同。

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近鏡再睇

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呢塊係783999，第80000多部，右邊個點接近冇左。

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呢部係bubu大哥既747403

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呢部係bubu大哥既750228，約第五萬部，比四萬幾部又淺左好多。

C9.99

如果根據上面幾個sample, 果三個圓痕係越來越淺。
希望再有多些例子參考下。

bubu

我嗰兩部嘅左右兩粒圓點位置不一樣

bubu

哈哈，我開始懷疑我部747字頭嘅背板唔係同期嘅，否則佢嘅左右兩點為什麼靠邊啲呢？可惜我另一部875字頭嘅入左菲林，唔開得check系咪左右兩粒都靠邊。

Pandachief

I performed some study on Leica back door a couple years back.  There's more variations than 3 dots shallower or deeper... For early ASA200 back door, actually have a batch without any dots!

Pandachief

For BIG LETTER ASA200 back door, suppose even earlier, have 2 dots instead of 3.

Pandachief

Like this!!

Pandachief

Just in case you never notice theres two type of fonts for back door engraving, this is what I call BIG LETTER. You can compare the fonts with your regular M3.

Pandachief

I don't have my 7003xx with me now but that is the camera with early ASA200 back door but no dots at all! Other than dots, there's also a lot of different back door design! Can spot a few different types even for first 1000 M3.

Pandachief

Note there's also half dots on the side too! It appear on both side.  This appear most often in early M3.

Pandachief

This is one of example of minor variation that even most Leica book never mention or identified.  See the earliest back door, it don't have the silver screws on both side of the door.

Pandachief

The silver screw is suppose to secure the locking system's spring of M3 door but the cool thing about early M3 is it don't need the exposed screws but still have the spring action ball locking door! All internal!!

C9.99

Thanks Edison, 你最早期呢塊係咪屬於你部明星M3 - 700019？
背板兩邊側邊仲有冇兩粒波的？有冇回彈的？有鏍絲呢種係有回彈的，裡面應該有彈弓，利用果波的lock實外框個窿，待塊背在冇底蓋lock實的情況下不會自動開合。

Pandachief

It is not from 700019.. but another of my M3 also early one...  it still have the 回彈 ball locking but the spring etc are all internal!! No need a exposed screw!! Isn't early better!?!  Much harder to make!

C9.99

Pandachief 發表於 2015-1-3 02:28
It is not from 700019.. but another of my M3 also early one...  it still have the 回彈 ball locking  ...

嘩，如果冇果口鏍絲但仍然有回彈，咁最早期M3既工藝真係勁，唔用screw做開關，密封式都可以係入面加彈簧！

Pandachief

Yes yes!! When I discovered it a couple years ago, I am very very amazed too!! But not all early M3 have such door, My 7003XX don't have...