Sure, Lighter. Here are the lyrics from the 1820s broadside. Some of the verses seem possibly derived from even earlier folk traditions (e.g., the seas are deep, and I cannot … neither have I wings to fly) but it also has some very interesting differences from more modern versions, for example "My heart is lock'd up in thy breast". And yet I find modern versions lyrically superior in many respects, and therefore an improvement.

Peggy Gordon

Sweet Peggy Gordon, you are my darling,
Come set you down upon my knee,
And tell to me the very reason,
Why I am slighted so by thee.

I am deep in love, but I dare not show it,
My heart is lock'd up in thy breast;
I will plainly let the whole world know it,
A troubled mind can take no rest.

I'll lean my head on a cask of brandy,
That is my fancy I do declare;
For when I'm drinking, I'm always thinking,
How shall I gain that young lady fair.

I wish my love was one red rose,
And planted down by yonder wall,
And I myself was one drop of dew,
That in her bosom I might fall.

I wish my love and I were sailing,
As far from land as one could see;
Yes, sailing over the deepest waters,
Where love and care would not trouble me.

For the seas are deep, and I cannot wade them,
And neither have I wings to fly;
I wish I had some jolly boatman,
To ferry over my love and I.

I wish I was in Caro[p]age,
And my sweet girl along with me;
Sweet Peggy Gordon, you are my darling;
Sweet Peggy Gordon, I'd die for thee.

I wish I was in Covel's Castle,
Where the marble stones are black as ink,
Where the pretty girls they all adore me –
I'll sing no more until I drink.

Here is a pic of the original manuscript. If needed for serious research, I have a much more detailed PDF of it (6 MB).
Courtesy of New York Historical Society, 170 Central Park West New York, NY 10024.